| 摘要 |
PROBLEM TO BE SOLVED: To provide a polyethylenic crosslinked shrink film suitably used as a shrink packaging film having high heat resistance and a high heat shrinkage factor, good in shrinkage finish in an automatic packaging machine or transparency after packaging, hardly ruptured with respect to an article to be packaged having a projection and reducing the deformation of a container due to heating using an electronic oven. SOLUTION: In the polyethylenic crosslinked shrink film constituted of three layers, (a) the ethylenic polymer mixture of both surface layers is a mixture comprising 50-97 wt.% of linear low density polyethylene with a density of 0.900-0.930 g/cm<3> and 3-50 wt.% of an ethylene/α-olefin copolymer with a density of 0.850-0.900 g/cm<3> , (b) the ratio (surface layers/core layer) of the melt indexes of the ethylenic polymers of the surface layers and the core layer is 0.6-1.6 and (c) all of the layers are biaxially stretched longitudinally and laterally after the irradiation with electron beam of 30-120 kGy so as to become an uniform absorption dose in a thickness direction. |
